$ git clone -n https://src.fedoraproject.org/rpms/kf6-kparts.git /var/lib/mock/f42-build-side-1-3503819-45982/root/chroot_tmpdir/scmroot/kf6-kparts
Cloning into '/var/lib/mock/f42-build-side-1-3503819-45982/root/chroot_tmpdir/scmroot/kf6-kparts'...
$ git fetch origin 99a929a94b88181d7147e58290adac5475e5e51a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kparts
 * [new ref]         99a929a94b88181d7147e58290adac5475e5e51a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 99a929a 6.13.0